The focus of this article is maximizing the sum-rate wireless unmanned aerial vehicle (UAV) networks with intelligent reflecting surfaces (IRS) in presence system practical limitations. More specifically, we consider that phase compensation at IRS imperfect due to various factors such as device imperfections and channel estimation errors. Moreover, elements have limited switching frequency, whi...

A resource allocation algorithm for orthogonal frequency division multiple access-based and infrastructure-based relay networks is introduced in this paper. The algorithm is applied in the downlink of a single cell. Channel state information is exploited at the transmitting base station (BS) and at the transmitting relay stations (RSs). The algorithm coordinates the allocation of subcarriers, b...

Ultra-Dense Network (UDN) is regarded as a major development trend in the evolution of future networks, due to its ability to provide larger sum rate to the whole system and meet higher users' Quality of Service (QoS). Different from the existing heterogeneous network, UDN has a smaller cell radius and a new network structure. The core concept of UDN is to deploy the low power Base Stations (BS...

Smart and reconfigurable wireless communication environments can be established by exploiting well-designed intelligent reflecting surfaces (IRSs) to shape the channels. In this paper, we investigate how multiple IRSs affect performance of multi-user full-duplex systems under hardware impairment at each node, wherein base station (BS) uplink users are subject maximum transmission power constrai...